新增head标签内theme-color的配置项

_config.yml

@@ -470,6 +470,8 @@ site_verification:
 #   blockquote_padding_color: "#49b1f5"
 #   blockquote_background_color: "#49b1f5"
 #   scrollbar_color: "#49b1f5"
+#   meta_theme_color_light: "ffffff"
+#   meta_theme_color_dark: "#0d0d0d"
 
 # The top_img settings of home page
 # default: top img - full screen, site info - middle (默認top_img全屏，site_info在中間)